Speech output in DP2 disabled with upgrading of Android OS

The DroidPlanner 2 and Tower installed in my Samsung tablet SM-T330NU have no problem with speech output announcing change in flight mode and other warnings.

Recently after Android was upgraded to V5.1.1 , both DP2 and Tower speech output are disabled, with following error message after hitting “connect” button :–

                                  Unable to set "text to speech" language

Pls advise how to resolve this. Any help is greatly appreciated.

Does it help if I downgrade the Android OS back to V4.x,x, ?